24.在平面直角坐標(biāo)系中,B(b,0),C(0,c),且
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(1)求B、C兩點(diǎn)的坐標(biāo);
(2)如圖1.將△OBC平移至△ADE,點(diǎn)O對(duì)應(yīng)點(diǎn)為A(m,4),若△ABC的面積為11,求點(diǎn)E的坐標(biāo);
(3)如圖2,在(2)中,若AD,ED分別與y軸交于點(diǎn)H,F(xiàn).點(diǎn)P是y軸上的一個(gè)動(dòng)點(diǎn).
①當(dāng)點(diǎn)P在線段OF(不含端點(diǎn))上運(yùn)動(dòng)時(shí),證明:∠ADP+∠PBO=∠EDP+∠PBC;
②當(dāng)點(diǎn)P在y軸上線段OF之外運(yùn)動(dòng)時(shí),請(qǐng)直接寫出∠ADP,∠PBO,∠EDP,∠PBC之間的等量關(guān)系.